Calcule:

a) 7x . (2x - 5)
b) (3a² - 2a - 1) . 5a
c) - 3x . (4x
² - 3x + 1)
d) 2/5a . (a - 1/4)
e) (0,3x
² - 1,4x) . (- 0,2x³)
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